Genera and Species of Phytophaga. 241 
species formerly living in great abundance in those portions of 
the globe: indeed, several species of Sagra are still existing in 
Abyssinia and northern India. But I think it may be shown that 
these species originally migrated northwards from the southern 
tropics, and not southwards from more northerly latitudes. The 
African and Asiatic species of Sagra present two well-marked 
types ; the species found in either continent bearing those peculiar 
characters which belong to their congeners of that quarter of the 
world to which they geographically belong. Now had the genus 
originally spread itself southwards from the northern tropics 
across the equator, the species inhabiting Abyssinia and northern 
India ought surely to present more points of similarity than 
those of the more southern latitudes, as being nearer the com- 
mon source from which the genus originally sprang; this, however, 
is not borne out by facts, the species inhabiting those countries 
being as distinct from each other, and bearing respectively the 
characters of the African or Asiatic types as strongly developed, 
as those found in Madagascar, India or Java. 
Genus Doricuotoma, Hope. 
Dolichotoma Salvinii. 
Rotundata, ¢ subtriangularis, @ convexa, obscure eenea, sub- 
nitida; elytris rude et profunde punctatis, elevato-reticulatis, 
antice retusis, modice transversim gibbosis, disci maculis 
plurimis margineque explanato-sanguineis, hoc sat dilatato, 
zeneo-limbato, disco maculis irregularibus eneis notato. 
Var. A.—Elytris sanguineis, sutura, limbo exteriori, maculis 
rugulisque disci zeneis. 
B.—Elytris disco toto eneo. 
Long. 7 lin. 
Hab. Panama. Collected by Mr. Salvin. 
Antenne ¢ longer than half the body. Thorax twice as broad 
as long, sides oblique, base deeply bisinuate on either side, 
medial lobe emarginate at its apex; surface opaque, centre of 
disc impressed with a longitudinal groove, which terminates 
anteriorly in a narrowed ridge; this last is continued onwards to 
the apical margin. Elytra much wider than the thorax, their 
lateral border broadly dilated; shoulders regularly rounded in 
the ¢, obliquely rounded in the ¢; sides rounded, gradually 
narrowed from their middle towards the apex, the latter obtuse ; 
dilated margin smooth, opaque, impunctate. 
